Abstract
We investigate the prospect of detecting the Dark Matter (DM) candidate in the three-loop radiative neutrino mass generation model extended with large electroweak multiplets of the Standard Model (SM) gauge group, at the future imaging atmospheric Cherenkov telescope known as the Cherenkov Telescope Array (CTA). We find that the addition of such large electroweak multiplets leads to a sizable Sommerfeld enhanced annihilation of the DM with $O(\text{TeV})$ mass, into the SM gauge bosons which results in continuum and line-like spectra of very high energy (VHE) gamma-rays, and therefore becomes observable for the CTA. We determine the viable models by setting the upper limit on the $SU(2)_{L}$ isospin of the multiplets from the partial-wave unitarity constraints and the appearance of low-scale Landau pole in the gauge coupling. Afterwards, by considering the continuum VHE gamma-rays produced from the DM annihilation at the Galactic center, we probe the parameter space of the model using the sensitivity reach of the CTA.
Highlights
In recent years, the Imaging Atmospheric Cherenkov Telescopes (IACTs) have opened new avenues for ground-based very high-energy gamma-ray astronomy [1,2,3] but have offered a testing ground for the dark matter (DM) of the Universe [4,5]
We investigate the prospect of detecting the dark matter (DM) candidate in the three-loop radiative neutrino mass generation model extended with large electroweak multiplets of the Standard Model (SM) gauge group, at the future imaging atmospheric Cherenkov telescope known as the Cherenkov Telescope Array (CTA)
We find that the addition of such large electroweak multiplets leads to a sizable Sommerfeld enhanced annihilation of the DM with an OðTeVÞ mass, into the SM gauge bosons, which results in continuum- and line-like spectra of very high-energy (VHE) gamma rays, and becomes observable for the CTA
Summary
The Imaging Atmospheric Cherenkov Telescopes (IACTs) have opened new avenues for ground-based very high-energy gamma-ray astronomy [1,2,3] but have offered a testing ground for the dark matter (DM) of the Universe [4,5]. Which is an ongoing international development project for a next-generation IACT, will have the capability to observe gamma rays with energies from 20 GeV to at least 300 TeV over a large area and wide range of view (up to 10°) with more than 100 telescopes located in the Northern and Southern Hemispheres This will allow the CTA to achieve a sensitivity about a factor of 10 better than current instruments such as H.E.S.S., MAGIC, or VERITAS [14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30]. In Appendix A, we present the detailed calculations relevant for our partial-wave unitarity constraints
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